If you look like you have authority, you do.
My issues with my F/A uniform was mostly what it was made of. The polyester pants stuck to my butt when it was hot out, whenever I stood up I literally had to peel them off my rear. Nice visual, eh? The Cadillac-Emblem shirts tended to be hot, and didn't hold a press well. The new dresses (also 100% polyester) were lined with a poly lining that stuck to skin like glue, when it was above 60 degress I was forever trying to unstick my dress from my back. Also these new dresses were not made with any 'give' as far as lifting ones arms. (Hmm, reaching & stretching, there's something a F/A never does on the job....) So when we would lift our arms, the entire dress would come up. So if the dress was hemmed any shorter than about knee length we'd end up giving quite a show when we reached for something.
Basically the uniforms are made by the cheapest bidder, whoever can manufacture them the quickest & cheapest gets the bid. This usually ends up resulting in a product that may look nice from a distance, but is really quite cheap & uncomfortable to wear for 12+ hours a day.
Delta's pilot uniforms are at least a poly/wool blend, and their jacket is nicest out there. Their current F/A uniforms (when they were first issued) were a logistics nightmare. They would fall apart at the seams after one wash, showed pit stains something fierce, did not fit anyone properly, and were just generally of extremely poor quality.
But, complaints aside, the uniform is an integral part of both the pilot's and F/As image. Both need to be kept professional. At Eagle we had a uniform polo issued a few years ago. It was comfortable, but the pax were forever not recognizing the working F/A. I took to only wearing it when I was doing IOE, that way my student would be in full 'regular' uniform, and I would be quite inconspicuous in the polo. If a pax needed something, they went to the student! Which is how I (as an IOE instructor) wanted it!